You mean worse as in lame, or as in the one who made the heroes and/or audience the most upset/angry/hateful?

I honestly like all of them, thought it can be tired sometimes

Emperor Zorg he was originally Bus father

Smellweather

Zurg’s identity seemed sensible, considering Buzz’s character arc.

"That was his mistake".

Stinky Pete plot twist was amazing.

AUTO's was pretty good, he loved doing his program but then thing get turned around, which he doesn't want that.

Robert's is what I can say the weakest out of all them for obvious reasons.

Bellwether's was decent.

Evelyn's was great.

Zurg's was my personal favorite out of them all, cause instead of that I'm your father joke, he is Buzz Lightyear the entire time!

@Heartz13 So, let me get this straight: Bellwether wants to get rid of predators because she feels like all prey should be on top and did this of not being appreciated in Zootopia?

Yup, pretty much.

Bellwether is A Twist Main Evil Villain Antagonist All Along